Machine-tool.



J. F. DEMARCHI.

MACHINE TOOL. APPLICATION FILED JUNE 28, HHS.

1,246,245 Patented Nov. 13, 1917;

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' 'J OSEPH F. ZDEMAiRCHLJOFBEAST ORANGE, NEW JERSEY.

: Specification of Letters-Patent.

'BatentedNova13,591 7.

Applicationfiled'JuneQS, 1316. Serial Np; 106,328.

To all whomz't may concern U "Be it known that "JOSEPHF." DnMAR'orIn-a citizen of theUnited States, and residentof East Orange;EsseX county, New J ersey, has invented certain new and euse'ful lm'p'rovements in lVIachine-Tools, ofwhich 'the following' is a specification.

This invention relates'to .machinetools, such as taps, reamersyonthelike, adapted to be used as finishing tools. v

"The invention has 'for' an JObj8Cl3' the pTO- vision of an adjustable toohof 'this type which is not only adapted for reamingor tapping holes offdifferent sizes with thejsame tool but which may also be used to .operate in an opening of smaller "diameter at the point'of insertion of'thetool'than'at the point where the tool is to"operate. "'-T-his function is accom'pli shed' bylmeans of the novel features of construction 'whiblPw-i ll 'be described hereinafter.

A further obj eflct is to" provide j a simple construction forgan. expanding tool er this type. I

For further comprehension of the invention, and of the objects and atlvaritages thereof, reference will be had to the following description taken in. connection with. the accompanyingdrawings, and to the appended claims in which the novelfeaturesof the invention are moreparticula'rly set-forth.

' In the accompanying "drawings illustrating, an embodiment of myinventi on I Figure 1' is a longitudinal elevationpf a machine tool embodying the invention,

-Fi g. 2. is a. longitudinal section thereof.

Fig. 3 is a transverse section on the' iine 33ofr'Fig.f,2.

Fig. 4; is a. similar view ofthe l'lHe' -MDf Fig.2. I

Fig.1i5' .is an end view-thereof.

Figjfi is a" detailview .inzrlongitlidinal "elevation of the adjusting member.

As here showmmy improved machine tool comprises a cylindrical casing'"1,"the forward portion of which is formed withaseries of elongated radial slots 3. Mounted in these slots to slide radially in the casing are reamer bars or cutting members 4 having cutting edges 5 formed thereon. Adjacent the forward end of the casing the slots 3 extend only partially through the wall of the casing in a radial direction but entirely through in a longitudinal direction, as indicated at 3, while the reamer 0r cutter bars have theirouter portions, -'-on which a are formed the outting edges 5longer than their inner portions and extending through the forward ends or the slots *3 substantially flush-with the forward en d of the ca'si ngt- 1. This arrangement permits the 1 toel to he fused to reamfoutan opening to the-bottom wall thereof.

These reamer bars 4' have angular grooi 'es 6* cut longitudinally on one face thereoffto providefdove-ta-iled portiens'laon the bars at, which engage in sin'iilarly for-medslots 8 in an adjusting member 9,' w-hieh isi sl'nlably posit-iOnedZ-inthe casing 1, and-ms shown most clearly 'in lj ig's. l 4: and 5, fitssnugly, or closely, in" the interior of the casing.

This adjusting '-mem'b'er '9" may be inserted tl11ough" t-heforwardor rig-ht hand end,: as shown--i11-Figs.'1*and'2, of the easing lf a rem'ovable'ca'p or plug 10 being-screwed into said end a-nd ser'vingto limitj movement of the a d-j LlS iZlHg member 9 in one direction, movement F in the opposite 'direction lo ein' g li mited by co-actingshoulders, indicated -wat 11, formed on the adj us'ting me nber 9 and interior wall of the casing." The 'slOtsY-S in the adjusting member 9 converge inwardly or taper toward the front oreright hand end, as shown-inFigsfil and 2, and -the dove tail portions-'7 of the reamer 1 bars: are corrcspondingly inclined, as clearly shown {in Figf 2. The OPQI'EItlIIg PQl'tlOHSf of. theadjust'ing member 9, that 'isthe portionsrepresented by the bottom faces ofthe slots 8,=z are thus "of wedgeshape. In the face vie-W5 the slots 8-will have the appearanceohwidening towardi the rear, as shown in- Fig; 6, b'y l-re-ason of the slotsbeing cut on tapers while the sides are parallel. K

av-ill be apparent that when the adjusting a member 9 {is moved longitudinally int-he' casing} l the inclined: surface ofi'zthe slots and the reamerbai s wi ll cause the latter to be forced inwardly or outwardly in {the slots*'*3 *to contl'ra'zt or expandthe -'rearner, according to the direction of movement of the rod 9, these inclined surfaces constituting in effect cams. As will be clearly apparent from Fig. 2 of the drawing, an inwardly facing transverse wall is formed adjacent the forward end of the casing. by the plug 10, this wall engaging the forward ends of the inner portions 7 of the cutter bars 4 to prevent forward displacement thereof while the outer portions project forwardly over this wall 10 to the desired point to enable the same to cut to the bottom of a hole.

The means which I have shown for moving the adjusting member 9 longitudinally in the casing 1 comprises a screw 15 threaded into the left hand end of the adjusting member 9 which extends rearwardly of the cutting bars the screw 15 being held against longitudinal movement by any suitable means, as'the pin 16 engaging an annular groove 17 in the screw. The screw 15 may also have a flange 18 thereon which bears against a shoulder 19 on the casing to take the end thrust. I have here shown a squared head 20 at the rear end of the casing 1, while the screw 15 may have a square socket 21 formed therein for insertion of a key to rotate the screw 15. It will be noted that the engagement of the reamer bars i in the slots 8 prevents rotation of the adjusting member 9.

The method of use of my improved tool will be apparent from the above description but it may be added that when the tool is to be used on a boring which may have a smaller diameter at the point of insertion of the reamer than at the point where the cutting bars are to work the reamer is inserted in the opening and the bars expanded after inserting, before mounting the reamer in the chuck of the lathe or other machine. Similarly, to remove the reamer the chuck is removed and the reamer bars contracted to permit the tool to be withdrawn through the smaller opening.

In contracting the bars 4, the dove-tailed portions 7 engaged in the corresponding slots 8 in the adjusting member 9 operate positively to draw the bars inwardly. This feature is important in devices of this nature, as it is necessary for the bars 4 to fitsnugly in the slots.

It will be apparent that various changes and modifications might be made in the construction as illustrated without departing from the scope of the appended claims.

V] hat I claim is:

1. A machine tool comprising a cylindrical casing having a plurality of radial slots therein, cutter bars positioned in said slots, and an adjusting member fitting snugly within the cylindrical casing and adapted to engage the inner portions of said cutter bars to adjust the position of the same radially in said slots, the said casing presenting an inwardly facing transverse wall adjacent its forward end adapted to engage the inner portions of the forward ends of the cutter bars to prevent forward displacement of the latter said cutter bars having their outer portions projecting forwardly beyond the said inner portions over the said transverse wall.

2. A machine toolcomprising a cylindrical casing having a plurality of radial slots therein extending longitudinally through to the forward end of the casing, said slots extending only partially through the casing in a radial direction adjacent the forward end thereof, cutter bars positioned in said slots, said cutter bars having their outer portions extending forwardly beyond their inner portions through the last mentioned portions of the said slots, and an adjusting member fitting snugly within said casing and slidable therein and adapted to engage the inner faces of the cutter bars to adjust the latter radially in the said slots.

3. A machine tool comprising acylindrical casing having a plurality of radial slots therein, cutter bars positioned in said slots, and means adapted to engage the inner portions of said cutter bars to adjust the position of the same radially in said slots, said cutter bars having their cutting portions longer than said inner portions and extend ing outwardly substantially flush with the forward end of the casing.

a. Ainachine tool comprising a cylindrical casing having a plurality of radial slots extending through the wall thereof, said slots adjacent the forward end of the casing extending only partially through said wall radially but entirely through in a longitudinal direction, cutter bars positioned in said slots, said cutter bars having portions extending through the forward end of said slots substantially flush with the forward end of said. casing, and means for adjusting said cutter bars radially in said slots.

Signed at the city, county and State of New York, this 22d day of June, 1916.

JOSEPH F. DEMARCHI.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. i 

